Your healthcare provider will monitor you, especially with the first dose
How should it be stored?+ Lyophilized vials should be kept at 20C, away from light and moisture
Often, the next test is serum methylmalonic acid (MMA), a functional marker of B12 deficiency that's produced when there's not enough active vitamin B12 present
Contact your GP if you experience: Persistent anxiety, panic attacks, or mood changes that interfere with daily functioning Physical symptoms accompanying anxiety, such as palpitations, chest tightness, breathlessness, or dizziness Neurological symptoms including numbness, tingling (paraesthesia), balance problems, or memory difficulties Symptoms that began shortly after starting B12 supplements or changing dosage Concerns about potential B12 deficiency (fatigue, pallor, glossitis, cognitive changes) Your GP can conduct a thorough assessment including medical history, medication review, and physical examination